The St. Louis Gateway Arch

Reverse Parabola: y=-(x^2)
Domain: (-inf, +inf)
Range: (-inf, 0)
Symmetry: even across y-axis
Example: y=-(2^2)=-(4)=-4 y=-(-2^2)=-(4)=-4
Continuous
End behavior:
lim f(x) = -inf
x --> -inf
lim f(x) = -inf
x --> inf